12 (b) The apparatus is then set up as shown in Fig. 1.3.
The rule is at a small angle to the bench.
2
metre rule
hook
zero mark
bench
Fig. 1.3
A student measures the length of the stretched spring and obtains the result
12 = . 4.4 cm.
(i) He then places a metal block X with its centre at the 40.0 cm mark on the rule.
Explain briefly how the student can make sure that the block is in the correct
position. You may wish to use a diagram.